Sewing machine



Feb, 17, 1925.

P. C. BLAKE ET AL SEWING MACHINE Filed Nov. 14, 1922 2 Sheets-Sheet 1 ATTORNEY Feb. 17, 192s.

P. C. BLAKE ET AL SEWING MACHINE l Filed Nov. 14, `192.2

2 Sheets-Sheet 2 l WITNESSEI ATTORNEY Patented Feb. 17, 1925.

UNITED vSTATES PATENT OFFICE. l

PERLEY C. BLAKE, OF HAVERHILL, MASSACHUSETTS, AND JOHN C. RINGE, OF STRAT- FORD, CONNECTICUT, ASSIGNOR-S T THE SINGER MANUFACTURING COMPANY, 0F ELIZABETH, NEW JERSEY, A CORPORATION 0F NEW JERSEY.

SEWING MACHINE.

Application filed November 14, 1922. Serial No. 600,817.

To all whom t may concern:

Be it known that we, PERLEY C. BLAKE and JOHN C. RINGE, residing, respectively, at Haverhill. in the county of Essex and State of Massachusetts, and at Stratford, in

the county of Fairfield and State of Connecticut, have invented certain new and useful Improvements in Sewing Machines, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to improvements in edge-shipping mechanisms forsewing machines and has for its object to provide a simplified construction of this character which is thoroughly efficient in operation and capable of being at will thrown into and out of operation.

In its preferred embodiment, the present Jimproved construction comprises a cuttingblade. disposed in a plane substantially transverse to the line of feed and carried by a pivotally supported lever yieldingly urged under the action of a spring into an inoperative position determined by a suitable stop. Pivotally supported by this lever is a bladeactuating arm adapted to be thrown into and out of operative engagement with an eccentric carried by a shaft rotated at a speed to impart a work-snipping movement to the cutting-blade for each two stitches formed. During the snipping operation, the actuating arm referred to rests upon the eccentric under the action of the lever throw-out spring and in a position determined by a suitable stop collar defining a point of engagement beyond a vertical line containing the pivot-axis of the actuating arm, whereby there is no tendency for the arm to ride off the eccentric during the snipping operation.

In order to, at will, throw the actuating arm into and out of operative engagement with the eccentric, there is provided a manually controlled shift-element having a camslot coacting with a stud projecting from the actuating arm to swing the latter laterally off the eccentric, a suitable stop limitin the throw-out movement of the arm. The s iftelement is disposed to engage the bladecarrying lever to lift the same against the action of its spring, thereby permitting the arm to swing into its operative position upon the eccentric Should the arm fail to swing into this position upon said lifting of the lever. a wall of the cam-slot referred to engages the arm-stud to positively insure the operative position of the arm.

In the accompanying drawings, Fig. 1 is a sectional -view in frontside elevation of a sewing machine embodying the present improvement. Fig. 2 is a rear side elevation of a portion of the same. Fig. 3 is an enlarged top-plan of the work-supporting arm of the sewing machine sectioned through the vertical standard thereof. Fig. 4 is a topplan view of the front portion of the worksu porting arm. Fig. 5 is a sectional view l su stantially on the line w-- of Fig. 4. Fig. 6 is a sectional view substantially on the line y-y of Fig. 4. Fig. 7 is aview ofaportion of the work un-snipped. Fig. 8 is a topplan View of the work showing both snipped and uli-snipped portions thereof. Fig. 9

is a sectional view of the work after it is Y folded.

Referring to the drawings, the sewing machine illustrated is constructed substantially as fully shown and described in the patent to Albert Rontke, No. 989,538, dated April 11, 1911, and comprises a work-arm or cylinder 1, from which rises the hollow armstandard 2 and overhanging bracket-armV 3 terminating in the head 4. Journaled in suitable bearings provided in the arm-standard and overhanging bracket-arm is the main or needle-bar actuating shaft 5 carrying at one end the usual belt-pulley 6. The main-shaft 5 also carries the pulley 7, connected by means of the belt 8 with the pulley 9 secured upon the loop-taker actuating shaft 10, suitably journaled in bearings provided in the work-cylinder 1 and carrying the loop-taker 11.

At its forward end, the main-shaft 5 carries the flange l2 in which is secured,by means of the screw 13, the crank-stud 14 embraced by the sleeve 15 on one end of the link 16. The other end of the link 16 is provided with a sleeve 17 entered by the pin 18 projecting from the collar 19 suitably secured upon the needle-bar 20, carrying the needle 21. By means of this construction, endwise reeiprocatory movements are imparted to the 'needle-bar 20, which isjournaled in vertically alined apertures formed in the oscillating feed-frame 22. The looptaker 11 which coacts with the needle 21 in the formation of lock-stitches, is rotated twice for each reeiprocation of the needle by virtue of the ratio of the pulleys 7 and 9.

The feed-frame 22 is mounted to oscillate upon pivotal bearings comprising the fulcrum-stud 23 threaded into the overhanging arm and the stud 24, secured in the arm 25 of the feed-frame and journaled in a suitable aperture provided in the work-cylinder 1. To the forward end of the arm 25 of the feed-frame is secured the feed-bar 26 having the usual feed-dog 27 projecting upwardly through the aperture 28 provided in the throat-plate 29 suitably secured upon the Work-cylinder 1. The feed-frame 22 receives its oscillating movements from an eccentric 30, 0n the main-shaft 5 and embraced by the strap 31 having the apertured boss 32 adapted to be entered by the pin 33. The pin 33 is formed or otherwise provided with an eccentric portion 34 which is adjustably secured by means of the screw 35 in the apertured ear 36 provided on the feed-frame. The eccentric 30 may be adjusted to vary the feed by means of the rod 37 in a manner well known, and as fully shown and described in the patent to W. F. Dial et al., No. 718,988, January 27, 1903.

Projecting from the rear side of the workcylinder 1 1s a lug or supporting bracket 38 apertured for the reception of a headed pivot-pin 39 secured in position by means of a set-screw 40. Journaled for oscillatory movements upon the pivot-pin 39 is the hub 41 of a lever 42 provided at its forward end with a head 43 upon which is adjustably secured, by means of screws as 44, the slotted shank of a cutting-blade 45 having its cutting edge disposed in a plane substantially transverse to the line of feed. A spring 46 having one end secured to the machine head 4 and its other end to the lever 42 urges the forward end of the latter into a raised or inoperative position determined by a stop-screw 47 projecting above the work-supporting cylinder and disposed to engage a boss 48 on the rear end of the lever 42. The boss 48 is apertured for the reception of a headed pivot-pin 49 secured in position by means of a set-screw 50. The pin 49 pivotally sustains an actuating arm 51 in its operative position disposed to ride the surface of an eccentric 52, having a flange 53 and secured upon a shaft 54 by means of a set-screw 55. At the side opposite to the flange 53, the eccentric 52 is formed with an inclined arm-guiding surface 52', facilitating the movement of the arm into operative engagement with the eccentric. rlhe shaft 54 is jourualed at one end in a bushing -56 secured in a suitable aperture in the bracket 38 by means of a screw 57, the shaft being held against endwise movement by means of a collar 58 at one Side of the bushing and the eccentric 52 at the other side thereof. At its rearward end, the shaft 54 is journaled'in an apertured lug 59 provided on the machine frame, and adjacent said lug there is suitably secured upon the shaft 54 a spur-gear 60 meshing with a pinion 61 suitably fixed upon the loop-taker actuatingshaft 10. The relative proportions ofthe gearing GO, 61 are such that the shaft 54 is rotated once for two rotations of the main-shaft 5.A

In order tout will. throw the snipping blade into and out of operation there is provided a n'ianually controlled shift-element comprising an oscillatory cam-plate 62 rigidly carried by the end of a transverse rock-shaft 63 ournaled in a bracket G4 upon the work-cylinder. Upon its front end, there is suitably secured upon the rock-shaft 63 a hand-lever 65 whereby the cam-plate 62 may be oscillated. The cam-plate 62 is provided with a notch or cam 66 entered by a stud 67 threaded into the arm 51 and is also provided with a stop-pin G8 for limiting the throw-out position of said arm 51. By reference to Fig. 2 of the drawings, it will be observed 'that the point of engagement of the arm 51 with the eccentric 52 in the Vposition determined by the flange 53 under the action of the spring46 is beyond a vertical line through the pivotal axis of the arm 51. Consequently the tendency, during the operation of the eccentric upon the arm 51, is to maintain the arm in engagement with the flange 53 thereby 0bviat ing the necessity of providing latches or other similar contrivances to hold the parts in operative position.

Still referring to F ig. 2 of the drawings, when the hand-lever is swung from the position indicated in a direction toward the blade 45, the wall 69 of the cam-notch 66 will engage the stud 67 and swing the arm 51 laterally ott the eccentric into a position determined by the stop-pin 68. As soon as the arm 51 leaves the eccentric, the spring 46 is free to rock the lever 42 about its fulcrum to raise the blade 45 into an inoper ative position determined by the stop-screw llf) 47. Obviously' the arm 51 cannot climb the inclined surface 52 of the eccentric 52 of its own accord against the action of the spring 46 and therefore no latches are required to loclr the cutting blade in inoperative position. lVhen the hand-lever 65 is manually swung in a direction away from the cutting-blade in the inoperative position of the latter, the edge 70 of the camplate 62 engages the boss 48 of the lever 42 and lifts the rearward end of the latter, thereby depressing the cutting blade into operative position. The arm 51 in its inoperative 1position is laterally displaced f is a spring-pressed follower 74 which 1s from a vertical position and therefore the action of lifting the rear end of the lever seek its vertical position, thereby engaging the operative face of the eccentric. Should the arm 51 however fail to perform this swinging movement, the wall 71 of the carnnotch 66 acts upon the stud 67 to insure such movement of the arm into its operative position, which movement is facilitated by the inclined surface 52 of the'eccentric.

Coacting with the movable cutting blade l is a stationary or ledger-blade 72 fixed upon the throat-plate 29 by means of screws as 7 3. Dove-tailed into the throat-plate under the action of a spring 75 secured upon the work-cylinder l to yieldingly close up the aperture in the throat-plate adjacent the ledger-blade and to assist in mamtainmg the blades in shearing relationship. The position of the movable blade 45 with respect to the ledger-blade may be adjusted by means of the fastening screws 44 and a set-screw 76 threaded into the head 43 and bearing against the blade. It will be observed that the edge of the follower. 74 adjacent the ledger-blade is slightlyinc-llned with respect to the latter to facilitate the movement of the blade 45, while the usual aperture 77 is provided for the blade guidefinger.

While a sewing machine fitted with thepresent improved snipping mechanism is adapted for effecting a large variety of products, it is particularly adapted for use in the production of a French cord edge in the manufacture of shoes. In Figs. 7, 8 and 9 of the accompanying drawings, there are illustrated several steps taken in one method of producing a French cord edge. A folded galloon g containing a cord c is directed to the needle 2l and under the feeding foot 7 8 and presser-foot 79 preferably by means of a suitable guide 80, for attachment to a shoe upper m by a line of stitches s penetrating the galloon and the upper ona line closely adjacent to the cord and between the cord and the margins of both materials, the margin of the shoeupper being preferably skived as indicated. After the corded galloon has been attached to the upper, the margins are folded under as illustrated in Fig. 9 and suitably secured in this position. It is evident that when sharp turns or curves occur in the work, some difficulty is encountered in smoothly folding the margins on account of the crimping of the materials. To this end it is desirable to provide a plurality of transverse slits b in the margins at such turns or curves but omit the slitting operation at substantially straight' portions of the work. The simple form of snipping mechanism herein disclosed is admirably adapted for this work and particularly by reason of ease of control of the movable knife for throwing it into and out of operation.

Having thus set forth the nature of the invention, what we claim herein is 1. An edge-snipping mechanism forsewing machines, comprising a cutting blade disposed in a plane substantially transverse to the line of feed, a blade carrying lever, a pivotal support for vsaid lever, a blade actuating arm pivotally sustained by said lever, a rotary eccentric for reciprocating said arm, means for relatively shifting said arm and eccentric into and out df effective operative relationship, and yielding means for retracting said lever from operative position in the inoperative position of said arm.

2. An edge-snipping mechanism for sewing machines comprising a cutting blade, a blade-carrying lever, a pivotal support for 'said lever, yielding means tending to 'rock said lever to carry said blade into an inoperative position, an arm pivotally -sustained 'by said lever, a rotary shaft, an actuating eccentric carried by said shaft having an inclined arm-guiding surface at one side thereof, and means permitting shifting of the free end of said arm along the inclined surface of said eccentric to operative position thereupon.

3.In a sewing machine, in combination, a cutting blade, a blade carrying lever, a pivotal support for said lever, a blade actuating arm pivotally sustained by said lever, a stop for determining the operative position of said arm,'a Arotary shaft, an

actuating eccentric carried by said shaft to i a stop for limiting the action of said spring in the inoperative position of said lever, an arm pivotally supported by said lever, a blade-actuating element' operating through said arm to limit the action of said spring in'the operative position of said lever, and means for at will swinging said arm' into an inoperative position. j

.5. An edge-snipping mechanism for sewing machines, comprising a cutting blade disposed in a plane substantially transverse to the line of feed, a blade carrying lever, a pivotal support for said lever,.a rotary blade-actuating element, a spring for yieldingly maintaining said lever in both operative and inoperative positions ,with respect to said actuating element, and a stop for limiting the action of said spring in the inoperative position 'of said lever, said actuating element functioning as a stop to limit the action of the spring in the operative position of said lever.

.6. An edge-snipping mechanism for sewing machines, comprising a cutting-blade disposed in a plane substantially transverse to the line of feed, a blade-carrying lever, a pivotalsupport for said lever, a spring urging said lever into an inoperative position, a blade-actuating arm pivotally sustained bysaid lever, a rotary eccentric for actuating said arm, and manually controlled means for swinging said arm out of operative engagement with said eccentric and permitting said spring to retract said blade out of operative positlon.

7. An edge-snipping mechanism for sewing machines, comprising a cutting blade, a blade-carrying lever, a pivotal support for said lever, a spring urging said lever into an inoperative position, a blade-actuating arm pivotally sustained by said lever, a rotary eccentric for actuating said arm, and a manually controlled shift element adapted to rock said lever from an inoperative to an operative position, said shift-element simultaneously insuring an operative engagement between said arm and said eccentric.

8. An edge-shipping mechanism for sewing machines, comprising a cutting blade, .a blade-carrying lever, a pivotal support for said lever, a spring urging said lever,

into an inoperative position, a manually controlled shift-element for rocking said lever from an inoperative to an operative position, a rotary eccentric, a blade-actuating arm, a pivotal support for said arm disposed upon said lever to permit a lateral shift of said arm uponA said eccentric when.

said lever is rocked from an inoperative to an operative position, and additional means carried by said shift-element for insuring the operative position of said arm.

9. An edge-snipping mechanism for sewing machines, comprising a cutting blade, a blade-carrying lever, a' pivotal support for said lever, a spring yieldingly urging said lever into an operati ve position, a manually controlled.l shift-element for rocking said lever from an inoperative to an operative position, a rotary eccentric, a blade-actuating arm, a pivotal support for said arm disposed upon said lever to permit a lateral shift of said arm upon said eccentric when said lever is rocked from' an inoperative to an operative position, means carried by said shift-element for insuring the operative position of said arm, and additional means on said shift-element for throwing said arm out of operative position.

10. An edge-snipping mechanism for sewing machines, comprising a cutting blade, a blade-carrying lever, a pivotal support for said lever, a spring yieldingly urging said lever into an inoperative position, a manually controlled shift-element for rocking said lever from an inoperative to an operative position, a rotary eccentric, a blade-actuating arm, a pivotal support for said arm disposed upon said lever to permit a lateral shift of said arm upon said eccentric when said lever is rocked from an inoperative to an operative position, means carried by said shift-element for insuring the operative, position of said arm, additional means on said shift-element for throwing said arm out of operative posi- Y tion, and means for limiting the throw-out movement of said arm.

11. An edge-shipping mechanism for sewing machines,lincluding aL cutting blade, a blade-carrying lever, a pivotal support for said lever, a rotary actuating element, an operative connection between said lever and said element comprising an arm pivotally supported by said lever and in operative position engaging said element at a point out of alinement with a vertical line passing through the pivotal axis' of said arm, vmeans for determining the operative position of said arm, and a spring acting upon said lever to yieldingly maintain said arm in its operative positlon.

12. An edge-snipping mechanism for sewing machines, including a cutting blade disposed in a plane substantially transverse to the line of feed, a pivotally supported blade-carrying lever, a rotary actuating element, an operative connection between said lever and said element, means for at will relatively-shifting said connection and said element out of and into operative engagement during the operation of the machine, and a spring actingupon said lever to yieldingly hold the actuating parts therefor in both operative and inoperative positions.

In testimony whereof, we have signed our names to this specification.

. PERLEY C. BLAKE.

JOHN C. RINGE. 

